<%--
  Created by IntelliJ IDEA.
  User: WYX
  Date: 2020-04-04
  Time: 17:55
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>

    <script src="${pageContext.request.contextPath}/statics/js/jquery-3.4.1.js"></script>
    <script>
      function a() {
        $.post({
          url:"${pageContext.request.contextPath}/a1",
          data:{"name":$("#username").val()},
          success:function (data) {
            alert(data);
          },
          error:function () {

          }
        })
      }
    </script>
  </head>
  <body>
<%--  失去焦点的时候，发送一个请求到后台--%>
  用户名：<input type="text" id="username" onblur="a()">
  </body>
</html>
